Triangular rule



(No Model.)

F. BENZINGER 8u H. B. GRABAU.

TRIANGULAR RULE.

No. 418,968. Patented Jan. 7,1890.

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FREDERICK BENZINGER, OF NEW YORK, N. Y., AND HANS EDGAR GRABAU,

OF HOBOKEN, NEYV JERSEY.

TRIANGULAR RULE.

SPECIFICATION forming part of Letters Patent No.

418,968, dated January '7, 1890.

Application filed September 26, 1889. Serial No. 325,204 (No model.)

To @ZZ whom t may concern:

Be it known that we, FREDERICK BENZING- ER, of the city, county, andState of New York, a citizen of the United States, and HANS ED- GARGRABAU, of the city of Hoboken, county of Hudson, and State of NewJersey, a citizen ot the Empire of Germany, have invented certain newand useful improvements in Oom bination-Rules, of which the following isa 1o specification.

Architects, engineers, and drat'tsmen use rules having various kinds otscales; and the object of our invention is to provide a combination-rnlein which the different scales generally used are united in a convenientmanner.

The invention consists in the combination,

with end pieces, of three rules of triangular cross-section pivotedbetween said end pieces zo in such a manner that the three rulestogether form a body having the cross-section of an equilateraltriangle.

The invention also consists in the construction and combination ot partsand de- 2 5 tails, as will be fully described hereinafter, and iinallybe pointed out in the claims.

In the accompanying' drawings, Figure 1 is a longitudinal view of ourimproved combination-rule, parts being broken out and oth- 3o ers insection. Fig. 2 is an end view ot the same, and Fig. 3 is a verticaltransverse sectional view of the same.

Similar letters of reference indicate corresponding parts.

The three rules A, B, and C each have a cross-section in the shape of anequilateral triangle, and said three rules are pivoted by means otscrews D between two equilateral triangular end pieces E, thepivot-screws D 4o being arranged at the corners of said end pieces. Therules A, B, and C are so pivoted and arranged that when their corre*spending sides are parallel and in the same planes they Aform a body thecross-section of which is an equilateral triangle, as shown in Figs. 2and It the two lower rules rest on the table or horizontal support, thetop rule can be turned independently of the lower rules, and thusadjusted to bring any one scale into proper position for using it. 5o Aseach rule contains six scales, our combination-rule contains eighteenscales, and if the rules are so arranged as to contain one scale at eachend the combinationaule will contain thirty-six scales. For example, therule A can have scales in which the inch is divided into halves,quarters, eighths, sixtecnths, thirty-seconds, and sixty-fourths. Therule B may have scales in which the inch is divided on the decimalsystem, and 6o the rule O may have scales on the meter system.

Any one of the rules can be brought into the most convenient position bysimply turning the entire device. The top rule--that is, the one beingusedw-can easily be soy turned that the side bearing the scale used willbe in a horizontal position or slightly-inclined position, thus makingit very convenient for the drattsman. Furthermore, com- 7o paring scalesof two diiterentkinds is greatly facilitated by the use of ourcombinationrule-or example, if the instrument is so placed that therules A and C are adjacent to each other, assuming that the rule Acontains the scales in which the inch is divided into halves, quarters,dsc., and the rule C contains meter measure, said two dimensions on thetwo different scales can easily be compared, and dimensions can beconverted from the sizes on one scale into sizes on another scale in avery short time. The rules are preferably provided with a core orfilling-piece M, into which the pivot-screws D may be screwed. Saidpulling-piece or core is described in our application, Serial No.325,202, filed September 2G, 1889, and we do not claim it in thisapplication.

Having thus described our invention, we claim as new and desire tosecure by Letters 9o Patent l. A combination-rule consisting of threerules having a triangular cross-section and 2. The combination, withthree rules of In testimony that We claim the foregoing 1o as ourinvention We have signed our names in presence of two subscribingWitnesses.

5 triangular cross-section, of triangular end AU pieces, between whichsaid three rules are pivoted, the pivots passing through The trivWitnesses: anguiar end pieces at the angles thereof, sub- OSCAR F. GUNZ,stantially as set forth.

W. REIMHERR.

